Adhesive compositions and laminates prepared therefrom

Claim 1

AN ADHESIVE COMPOSITION COMPRISING AS ESSENTIAL COMPONENTS THEREOF: (A) A HYDROXYL-TERMINATED TEREPHTHALATE COPOLYESTER, (B) A DIEPOXIDE HAVING TWO CYCLOHEXYL RINGS JOINED BY A DIVALENT LINKING RADICAL HAVING CARBOXYLATE FUNCTIONALITY, EACH SAID CYCLOHEXYL RING HAVING A SINGLE OXIRANE OXYGEN ATOM JOINED TO ADJACENT CARBON ATOMS IN THE RING, AND AT LEAST ONE MEMBER ADDUCT SELECTED FROM THE GROUP CONSISTING OF (C) A CARBOXYLIC ADDUCT OF PYROMELLITIC DIANHYDRIDE AND A POLYOL CHARACTERIZED BY TWO TO THREE HYDROXYL SUBSTITUENTS INCLUDING TWO PRIMARY HYDROXYL SUBSTITUENTS PER MOLECULE AND AS BEING FREE OF NON-BENZENOID CARBON-TO-CARBON UNSATURATION, EACH SAID PRIMARY HYDROXYL SUBSTITUENT THEREOF BEING CONDENSED WITH ONE MOLE OF SAID DIANHYDRIDE, AND (D) A POLYISOCYANATE ADDUCT OF AN ORGANIC DIISOCYANATE AND AN ALIPHATIC POLYOL COMPOSITION CONSISTING ESSENTIALLY OF AN ALIPHATIC TRIOL COMPOSED OF CARBON, HYDROGEN AND OXYGEN ATOMS AND HAVING TWO TO THREE PRIMARY HYDROXYL SUBSTITUENTS PER MOLECULE, THE PROPORTION OF SAID DIISOCYANATE COMPONENT OF SAID POLYISOCYANATE ADDUCT BEING SUFFICIENT TO PROVIDE ISOCYANATE GROUPS IN MOLAR EXCESS OVER THE HYDROXYL SUBSTITUENTS OF SAID POLYOL COMPOSITION UP TO A RATIO OF TWO ISOCYANATE GROUPS PER HYDROXYL SUBSTITUENT, THE PROPORTION OF SAID (C) PYROMELLITIC ADDUCT BEING 0.5-10 PARTS WHEN SAID (D) ADDUCT IS ABSENT AND SAID (D) POLYISOCYANATE ADDUCT BEING 2-25 PARTS WHEN SAID (C) ADDUCT IS ABSENT, SAID PARTS BEING PER 100 PARTS BY WEIGHT OF SAID (A) TEREPHTHALATE COPOLYESTER, SAID ADHESIVE COMPONENTS BEING COMPATIBLY IN SOLUTION IN A VOLATILE ORGANIC SOLVENT THEREFOR, SAID HYDROXYL-TERMINATED COPOLYESTER (A) BEING AN ESTER CONDENSATION POLYMER HAVING UNITS FROM AT LEAST ONE SATURATED ALIPHATIC DIOL COMPOSED OF CARBON, HYDROGEN AND OXYGEN ATOMS AND HAVING ONE TO TWO PRIMARY HYDROXYL SUBSTITUENTS PER MOLECULE AND UNITS FROM A PLURALITY OF DICARBOXYLIC COMPONENTS INCLUDING 25 TO 85 MOL PERCENT OF TEREPHTHALIC UNITS BASED ON THE TOTAL MOLES OF DICARBOXYLIC ACID UNITS, AND BEING CHARACTERIZED BY AN INHERENT VISCOSITY IN THE RANGE OF 0.4 TO 1.5 BASED ON THE RELATIVE VISCOSITY OF A SOLUTION OF 0.6 GRAM OF THE COPOLYESTER IN 100 ML. OF M-CRESOL.